slepc-3.22.2 2024-12-02

EPSSetProblemType

Specifies the type of the eigenvalue problem.

Synopsis

#include "slepceps.h" 
PetscErrorCode EPSSetProblemType(EPS eps,EPSProblemType type)

Logically Collective

Input Parameters

	eps	- the eigensolver context
	type	- a known type of eigenvalue problem

Options Database Keys

	-eps_hermitian	- Hermitian eigenvalue problem
	-eps_gen_hermitian	- generalized Hermitian eigenvalue problem
	-eps_non_hermitian	- non-Hermitian eigenvalue problem
	-eps_gen_non_hermitian	- generalized non-Hermitian eigenvalue problem
	-eps_pos_gen_non_hermitian	- generalized non-Hermitian eigenvalue problem with positive semi-definite B
	-eps_gen_indefinite	- generalized Hermitian-indefinite eigenvalue problem
	-eps_bse	- structured Bethe-Salpeter eigenvalue problem

Notes

This function must be used to instruct SLEPc to exploit symmetry or other kind of structure. If no problem type is specified, by default a non-Hermitian problem is assumed (either standard or generalized). If the user knows that the problem is Hermitian (i.e. A=A^H) or generalized Hermitian (i.e. A=A^H, B=B^H, and B positive definite) then it is recommended to set the problem type so that eigensolver can exploit these properties.

If the user does not call this function, the solver will use a reasonable guess.

For structured problem types such as EPS_BSE, the matrices passed in via EPSSetOperators() must have been created with the corresponding helper function, i.e., MatCreateBSE().

Level

intermediate

Location

src/eps/interface/epsopts.c

Examples

src/eps/tutorials/ex1.c
src/eps/tutorials/ex1f.F90
src/eps/tutorials/ex2.c
src/eps/tutorials/ex3.c
src/eps/tutorials/ex5.c
src/eps/tutorials/ex6f.F90
src/eps/tutorials/ex9.c
src/eps/tutorials/ex10.c
src/eps/tutorials/ex10f.F90
src/eps/tutorials/ex11.c
src/eps/tutorials/ex12.c

Index of all EPS routines
Table of Contents for all manual pages
Index of all manual pages